Implemented the 9V hand-solderable red LED blinker schematic using a TI NE555P DIP-8, through-hole LED, slide switch, PP3 9V battery holder, axial resistors, and through-hole capacitors. The 555 astable is set to about 1.06 Hz with ~50% duty cycle, so the LED blinks roughly once per second; electrical connectivity checks are clean.
Open items:
PCB layout/routing is not done yet, so airwire DRC errors are expected.
Generic passives have through-hole packages and values, but not exact manufacturer part numbers yet.
Suggested next steps:
Assign exact MPNs for the generic resistors/capacitors if you want a manufacturable BOM.
Move into PCB layout: size the board, place the battery holder/switch/LED, then route.
Add silkscreen labels for battery polarity, switch ON/OFF, and LED orientation.